package tools;

//import com.mysql.jdbc.Statement;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class pdf extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    /*
     * method servlet dibawah digunakan mengambil informasi pdf yang digunakan sebagai parameter untuk
     * mengambil jumlah baca dan memasukkan informasi pinjam ke dalam tabel pinjam.
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, SQLException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet pdf</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet pdf at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
             */
            String sql = "update buku set jumlah_baca = '" + getJumlah_baca(request.getParameter("document"))
                    + "' where pdf = '" + request.getParameter("document") + "'";
            Statement stmt = (Statement) KoneksiDataBase.getConnection().createStatement();
            stmt.executeQuery(sql);

            Peminjam p = (Peminjam) request.getSession().getAttribute("userName");

            String sql2 = "insert into pinjam(username, kode_buku) values ('" + p.getUsername() + "','" + getId_buku(request.getParameter("document")) + "')";
            Statement stmt2 = (Statement) KoneksiDataBase.getConnection().createStatement();
            stmt2.executeQuery(sql2);


            response.sendRedirect(request.getParameter("document"));
        } finally {
//            out.close();
        }
    }

    /*
     * method dibawah digunakan untuk menghitung jumlah pembaca yang telah membaca e-book tersebut.
     */
    public int getJumlah_baca(String request) throws SQLException {
        int jml = 0;
        String sql = "SELECT jumlah_baca from buku WHERE pdf = '" + request + "'";
        Statement stmt = (Statement) KoneksiDataBase.getConnection().createStatement();
        stmt.executeQuery(sql);
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            jml = rs.getInt(1) + 1;
        }
        return jml;
    }

    /*
     * method dibawah digunakan untuk mengambil ID buku berdasarkan pdf yang dipilih.
     */
    public String getId_buku(String request) throws SQLException {
        String id = null;
        String sql = "SELECT kode_buku from buku WHERE pdf = '" + request + "'";
        Statement stmt = (Statement) KoneksiDataBase.getConnection().createStatement();
        stmt.executeQuery(sql);
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            id = rs.getString(1);
        }
        return id;
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(pdf.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(pdf.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
